Add to cart fix

[jyotigautam]

Why?

To fix failure while adding line items to cart when inventory tracking is disabled.

This change addresses the need by:

Checking whether the inventory tracking is enabled or diabled for a given product before it's presence in the stock.

delivers #163724078

Checklist

• [ ] I have read CONTRIBUTING.md.
• [ ] My code follows the style guidelines of this project.
• [ ] I have commented my code, particularly in hard-to-understand areas.
• [ ] My code does not generate any (new) credo and compile-time warnings.
• [ ] I have updated the documentation wherever necessary.
• [ ] I have added tests to cover my changes.

[codecov[bot]]

Codecov Report

Merging #470 into develop will increase coverage by 0.08%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           develop    #470      +/-   ##
==========================================
+ Coverage    79.02%   79.1%   +0.08%     
==========================================
  Files          175     175              
  Lines         2198    2202       +4     
==========================================
+ Hits          1737    1742       +5     
+ Misses         461     460       -1

Impacted Files	Coverage Δ
...ps/snitch_core/lib/core/domain/stock/quantifier.ex	91.66% <100%> (+4.16%)	:arrow_up:
..._core/lib/core/data/model/general_configuration.ex	72.72% <0%> (+9.09%)	:arrow_up:

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